dragon: Update prebuilt kernel to ef15d9cac97d1c74a07cae92014224592dae2cc3

Build: trybot-smaug-paladin/R50-7897.1.0-b803

Changes include:
* ef15d9c Revert "HACK: f_fs: allocate DMA capable req buffer"

Change-Id: I328c59f4352fae6db78af9375225b7d4fa727d83
1 file changed
tree: b6841605bd1820cc70f5000adb1894aa16d62157
  1. Image.fit
  2. push-kernel.sh